Light weight sound record



/ Sept, 12,1933,

Y k r Filed Aug. 29, 1929 RECORD MATlR/A L.

T VARNISHED PAPER IMP/PEGA/A TED Macao/1R0 MR5 mzcona MATERIAL gwuento'vW Mae/rm Patented Sept. 32 1%33 ear 1,926,13ll I men's: waren'r somennccnn Samuel Whyte, lltedhill, England, assignor, by mesne assignments,to Eadie fillorporation of America, New Ycrlk, N. EL, a cerp'oration ofDelaware Application August 29 1929, Serial Ne. 389,327, and in GreatBritain September 1111, 1928 4 (Claims.

The present invention relates to disc sound records which are light inweight and may be flexible, and in particular to records of the type inwhich there is attached to an impregnated 5, and waterproofed cardboardcore, and on each side thereof, a disc of varnished paper carrying thesurface on which the record is to be impressed. This surface may consistof ordinary record material or have as its base a synthetic 1o resin.

According to the present invention, a record is made in the followingmanner: A cardboard core is impregnated with a composition consisting ofparafl'in wax, or metal stearates, or bituminous material, which flowsunder heat or pressure and thus soaks into the fibres and seals them.The heat and pressure may be applied to the core to force thewaterproofing material into it either before or after the paper disccarrying the rec- 0rd surface is applied.

The invention is illustrated diagrammatically in the accompanyingdrawing showing an enlarged sectional View of a portion of a recordblank.

A paper disc is coated on one or both sides with a varnish which willjoin the paper to the core. This varnish may consist oftri-nitrocellulose and rosin or of a thin paint made by mixing ordinaryshellac base record material with a solvent such as alcohol. Theimpregnated core and varnished paper should have a co-eflicient ofexpansion similar to that of the material applied to the paper to formthe surface of the record. Otherwise, the surface will develop anunevenness which spoils the appearance. of the record and increases thesurface noise. There is then applied to one side of each of the paperdiscs, preferably while the varnish is still wet, record material inpowdered form. For each side of a 4. 1d" record, from 1 to 1.25 ozs. ofrecord material is found generally to be sufllcient. The powder mayconsist of the ordinary record material with a shellac base. The discsare dried and then applied to each side of the cardboard core and thewhole is hot pressed between the matrices of the records to be produced.'The record (10") obiainedweighs approximately 3 ounces, is fairly rigidand wears well.

In place of the ordinary record surface mate- 60 rial. the urea and thethiourea resins may be used, but the resin used for the record surfaceshould contain a certain amount of filler, as this improves the wearingqualities. For example, a mixture of 35% of the urea resin, 35% thioureac5 resin and 30% barytes filler has been found to give good results assurface material. The surfacing mixture may be painted onto the paperdiscs instead of being powdered on.

I claim:

1. A sound record blank comprising a cardboard core impregnated with awaterproofing material, a varnished paper disc attached to each sidethereof, and record surface material on the outer side of each paperdisc, said core and discs having substantially the same coeflicients ofexpansion.

2. A sound record blank comprising a cardboard core impregnated withwaterproofing material, a varnished paper disc attached to each side ofsaid core and varnished with a mixture of shellac base record materialand a solvent, and record surface material including a synthectic resinon the outer side of each paper disc.

3. A sound record blank comprising a cardboard core impregnated withwaterproofing material, a paper disc on each side of said core andvarnished with tri-nitrocellulose and rosin,- and record surfacematerial including a urea resin on the outer side of each paper disc.

4. A sound record blank comprising a cardboard core impregnated withwaterproofing material, a paper disc attached to each side of said coreand varnished with a mixture of shellac base record material and asolvent, and record surface material including a urea resin on the outerside of each paper disc.

, SAMUEL WHYTE.

